Circuit breaker

Abstract

The invention provides a circuit breaker, which comprises a moving contact, a static contact, a rotation shaft and an operation mechanism, wherein the moving contact can rotate around the rotation center of the rotation shaft relative to the static contact, and through contact or breaking between the moving contact and the static contact, connection or disconnection of the circuit is realized; the operation mechanism comprises an upper connection rod, a lower connection rod and a handle, the upper connection rod is set to rotate around one end of the upper connection rod under the driving effects of the handle, the other end of the upper connection rod is connected onto one end of the lower connection rod in a rotary mode through a connection rod hinging shaft, the other end of the lower connection rod is hinged with the rotation shaft, the rotation shaft can be driven to drive the moving contact to rotate, the working length of the upper connection rod and the working length of the lower connection rod, and the working length of the upper connection rod and the distance between the hinging point between the lower connection rod and the rotation shaft and the rotation center of the rotation shaft have predetermined proportion relationships, the rotation angle of the moving contact formed after the moving contact and the static contact are disconnected is larger than 30 DEG, and the purpose of improving the breaking ability of the circuit breaker is realized.

Description

technical field [0001] The invention belongs to the technical field of electrical switches, in particular to a circuit breaker. Background technique [0002] As a protection component of the power transmission and distribution system, the circuit breaker can disconnect the circuit in time when a fault current occurs in the circuit, so as to ensure the safety of the entire circuit and other electrical loads. Circuit breakers usually have overload, short circuit and residual current protection functions, and due to the rapid development of power distribution systems, circuit breakers are constantly required to have higher breaking reliability and smaller volume. [0003] The structure of a circuit breaker commonly used at present is to have at least one contact mechanism that can be connected or disconnected, an opening and closing mechanism, a trip unit, an arc extinguishing mechanism, and the cooperation between the opening and closing mechanism and the trip unit. The main ...

AI Technical Summary

Problems solved by technology

[0004] In practical applications, in order to ensure the breaking performance of the circuit breaker, it is usually necessary to increase the volume of the circuit breaker or increase the length of the moving contact to maintain a large gap between the moving contact and the static contact of the contact mechanism. distance or increase the installation space of the arc extinguishing mechanism, but the above-mentioned methods ultimately need to increase the volume of the circuit breaker to improve its breaking performance. However, increasing the volume of the circuit breaker will reduce the reliability of the circuit breaker on the one hand and lead to decrease in market demand

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